Skip to content
ENExplore Calculators

Video File Size From Bitrate Calculator

Work out video file size from bitrate instantly with clear inputs, formula shown and shareable results.

About Video File Size From Bitrate Calculator

File size is bitrate times duration divided by eight to convert bits to bytes, with the audio stream added at its own bitrate. The divide-by-eight step is where estimates usually go wrong, and it is why a 50 Mbps codec fills 375 MB every minute rather than 50.

Formulas

File size

megabytes = bitrate in Mbps x seconds / 8

With audio

add audio kbps x seconds / 8000 megabytes

Worked example

With the default values below, Video File Size From Bitrate Calculator returns File size of 3.7692. Change any input above and every figure here is recalculated in your browser.

Inputs used

Bitrateminimum 0.01 Mbps
50 Mbps
Durationminimum 0.01 min
10 min
Audio bitrateminimum 0 kbps
256 kbps

Results

File size
3.7692 GB
File size in megabytes
3,769.20 MB
Size per minute
376.92 MB
Share of the file that is audio
0.51%

Step by step

  1. 1Values used
  2. 2File size
  3. 3With audio
  4. 4File size= 3.7692 GB
  5. 5File size in megabytes= 3,769.20 MB
  6. 6Size per minute= 376.92 MB
  7. 7Share of the file that is audio= 0.51

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Video File Size From Bitrate figure worked out?

megabytes = bitrate in Mbps x seconds / 8. File size is bitrate times duration divided by eight to convert bits to bytes, with the audio stream added at its own bitrate.

Why does this matter?

The divide-by-eight step is where estimates usually go wrong, and it is why a 50 Mbps codec fills 375 MB every minute rather than 50.

What do I need to enter?

Enter bitrate, duration, audio bitrate. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

Related Calculators

Video File Size From Bitrate Calculator | Calcrivo